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Re: [Openvpn-users] ADSL->ADSL OpenVPN, what MTU? 1492?

  • Subject: Re: [Openvpn-users] ADSL->ADSL OpenVPN, what MTU? 1492?
  • From: Nathan Barham <nathan@xxxxxxxxxxxxxx>
  • Date: Fri, 22 Apr 2005 08:15:51 -0700

Gregory G Carter wrote:

I have the following rules in place on all my firewalls:

iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT
iptables -A FORWARD -p icmp --icmp-type fragmentation-needed -j ACCEPT

If there is some other icmp type related to mtu path discovery I am missing, perhaps someone could point it out???

AFAIK Destination Unreachable (icmp type 3) is important for path MTU discovery as well.

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